Impact of brassinosteroids and ethylene on ascorbic acid accumulation in tomato leaves

Plant Physiology and Biochemistry : PPB
Luis Miguel Mazorra MoralesCarlos G Bartoli

Abstract

Plant steroid hormones brassinosteroids (BRs) and the gaseous hormone ethylene (ET) alter the ascorbic acid-glutathione (AA-GSH) levels in tomato (Solanum lycopersicum L.) plants. The interaction of these hormones in regulating antioxidant metabolism is however unknown. The combined use of genetics (BR-mutants) and chemical application (BR/ET-related chemicals) shows that BRs and ET signalling pathways interact, to regulate leaf AA content and synthesis. BR-deficient (d(x)) leaves display low total AA but BR-accumulating (35S:D) leaves show normal total AA content. Leaves with either BR levels lower or higher than wild type plants showed a higher oxidised AA redox state. The activity of L-galactono-1,4-lactone dehydrogenase (L-GalLDH), the mitochondrial enzyme that catalyses the last step in AA synthesis is lower in d(x) and higher in 35S:D plants. BR-deficient mutants show higher ET production but it is restored to normal levels when BR content is increased in 35S:D plants. Suppression of ET signalling using 1-methylcyclopropene in d(x) and 35S:D plants restored leaf AA content and L-GalLDH activity, to the values observed in wild type. The suppression of ET action in d(x) and 35S:D leaves leads to the respective decreasing an...Continue Reading

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Citations

Apr 15, 2014·Plant Physiology and Biochemistry : PPB·Anelia G DobrikovaEmilia L Apostolova
Feb 13, 2016·Frontiers in Plant Science·Els KeunenAnn Cuypers
Dec 14, 2018·Frontiers in Plant Science·Willian Batista-SilvaWagner L Araújo
Mar 20, 2021·Journal of Agricultural and Food Chemistry·Boqing ZhaoFang Yuan

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